Briton Mo Farah completed the double-double by winning the 5000m at the World Athletics Championships in Moscow.
The 30-year-old, who won both the 5000m and 10000m at last summer's Olympic Games in London, replicated the feat at the Luzhniki Stadium.
He produced a characteristic final-lap sprint to take gold in a time of 13:26.99, finishing ahead of Ethopia's Hagos Gebrhiwet, who made a late charge to take silver in 13:27.26.
Isaiah Koech of Kenya was forced to settled for bronze in the same time.
The victory consolidates Farah's status as one of the all-time distance running greats and arguably the best British track and field athlete in history.
In Daegu at the 2011 World Championships, Ibrahim Jeilan denied Farah a first world title but since the Somalia-born athlete has been unstoppable and has now retained the 5000m title he won in South Korea after his momentous performance in his home Olympics.
Farah, who is now based in Oregon, has worked with sprint coach John Smith to hone his finishing speed and set a European 1500m record of 3:28.81 in Monaco last month.
That speed was evident once more in a blistering final lap of 53.51 seconds, which left the African challengers in his wake.
Farah, under the guidance of his coach Alberto Salazar, now has eight major gold medals to his name and will surely look to add to his haul of three European titles in Zurich next year with fans hoping to see more of the famous 'Mobot' celebration.
It completed a good day for Britain as earlier Adam Gemili smashed his personal best to win his 200m semi-final in 19.98, becoming just the second UK athlete to break 20 seconds for the distance after John Regis.